Die-milling machine



2 Sheets-Sheet 1. E. MEYERS. DIE MILLING MACHINE.

(No Model.)

No. 453,018. Patented May 26,1891.

INVENTUH WI 1' NESSIS 2 Shets-Sheet 2.

(No Model.)

B MEYERS DIE MILLING MACHINE.

Patented. May 26, 1891.

WITNESSES.

WEI/V TUE flail) NITED STATES PATENT FFICE.

. ERNEST MEYERS, OF TAUN TON, MASSACHUSETTS.

DIE-MILLING MACHINE.

SPECIFICATION forming part of Letters Patent No. 453,018, dated May 26,1891. Application filed November 28, 1890. Serial No. 372,826. (Nomodel.)

To all whom it may concern.-

Be it known that I, ERNEST MEYERS, of Taunton, in the county of Bristoland State of Massachusetts, have invented a new and useful Improvementin Die-Milling Machines; and I hereby declare that the following is afull, clear, and exact description of the same, reference being had tothe accompanying drawings, forming part of this specification.

This invention has reference to an improved machine for cutting dies;and it consists in the peculiar and novel construction by which a cameodie may be automatically cut by a milling-tool from an intaglio die, orvice versa, and an enlarged or reduced die may be automatically cut fromanother die, as will be more fully set forth hereinafter.

Figure 1 is a front view of my improved die-milling machine. Fig. 2 is ahorizontal top View of the same. Fig. 3 is an enlarged vertical View ofthe traversing screw and mechanism for operating the same. Fig.4 is avertical section of the revolving die-holder and the stylus, shownpartly in section. Fig. 5 is a sectional view of the die-holder and themilling-tool. Fig. 6 is a sectional view of the adjustable fulcrum.

Similar numbers of reference designate corresponding parts throughout.

In the drawings, thenumbers 7 indicate the cross-frames forming thesupport of the machine. The bed-plate 8 is rigidly secured to thecross-frames 7, forming-a horizontal table provided with the slot 9,extending lengthwise through or nearly through the center of thebed-plate 8. The two sides of the bedplate have the undercut ways 10.The sliderests 11 and 12 bearon the surface of the bedplate 8 and titthe ways 10, so that the sliderests maybe moved longitudinally on thebedplate. hen adjusted to the desired position, the slide-rests aresecured firmly to the bed plate 8 by the clam p-screws 13. The sliderest11 forms the support for the die-holder 14, which isprovided with thespindle 15, turning in a bearing formed in the slide-rest 11. Thespindle 15 extends through the slot 9 in the bed-plate 8, and has theworm-gear 16 secured to it below the bed-plate and at its lower end thecone band-pulley 17, as is shown in Fig. 4. The slide-rest 12 supportsthe dieholder 18, provided with the spindle 19, on

which the worm-gear 20 is secured, as shown in Fig. 5. Both thedie-holders 14 and 18 are provided with suitable clamping devices forsecuring the dies. The shaft 21, supported in suitable bearings, isprovided with a longitudinal groove. The worms 22 and 23 are secured tothe shaft 21 by means of aclampscrew and may be adjusted along the shaft21. The worm 22 meshes with the worm-gear 16 and the worm 23 with theworm-gear 20, so that by rotating the shaft 21 the die-holders 14 and18, and with them the dies secured in the dieholders, are simultaneouslyrotated in the same direction, and as the worms, as well as theworm-gears, are of the same size and pitch both dies are rotated at thesame speed. By reversing the worm 23 the die-holder 1.8 will turn in theopposite direc' tion, but will turn at the same speed as the die-holder14.

The number 24 indicates a rigid bar supported over the bed-plate 8 abovethe dieholders, and on one side of the longitudinal slot 9, near one endof the machine, the lefthand end of Figs. 1 and 2, the bar 24 is adjustably secured in the yoke 25 by the clam pscrew 26. The yoke 25 ispivotally secured to the arm 27 by the screws 28, so as to allow theyoke to rock on the screws 28. The arm 27 is provided with a series ofholes, as is shown in Fig. 1, so that the yoke 25 may be secured atdilferent points on the arm 27, the screws 28 forming the verticalfulcrum of the bar 24. The arm 24 is provided with the spindle 29,journal'ed in the bed-plate or table 8. The spindle 29 forms thehorizontal fulcrum of the bar 24, which is vertically adjusted byraising or lowering the spindle 29 by means of the hand-wheel 29,secured to the screwspindle 29 by which the nut forming the support ofthe fulcrum-sp ndle 29 is raised and lowered. The opposite end of thebar 24 on the right-hand side of Figs. 1 and 2 is provided with the slot30, into which the post 31 enters. On each side of the slot 30a roll 32,journaled in bearings secured to the bar 24, is placed, by which thefriction on the post 31 is diminished and positive contact on the post31 secured to guide-bar 24 as it is raised and lowered. The strap orchain 33 is secured to the bar 24 near the end of the bar. The strapextends over two sheaves, and the other end is secured to the weight 34,by which the weight of the bar 24 is partly counterbalanced.

Over the die-holder14 the arm 35 is adj ustably secured to the bar 24.The spindle 36 is screw-threaded in the projecting end of the arm 35.The lower end of the spindle 36 forms the tracer or stylus 37. Theclamppiece 38 is connected with the arm 35 by the screw 39. By movingthe arm on the bar 24 until the tracer or stylus 37 is near the centerof the die-holder 14 and securing the clamp-piece 38 the arm 35 andstylus 37 can be accurately adjusted by the screw 39 and then secured bythe clamp-screws.

The bracket 40 is secured to the bar 24 over the die-holder 18. Thebracket 40 forms the bearing for the milling-spindle 41, having themilling tool or cutter 42 secured to' its lower end and the band-pulley43 to its upper end. The screw 44 forms the upper bearing for thespindle 41 and serves to adjust the spindle and the cutter. Aclamp-piece 3S and a screw 39 serve to adjust the bracket 40 in the samemanner as they are used in connection with the arm 35, as heretoforedescribed.

The vertical axes of the stylus 37 and the spindle 15 of the die-holder14, the millingspindle 41, and the spindle 19 of the (lie-holder 18, andthe fulcrum-spindle 29 are all on a line when in the position shown inFig. 2. The stylus and the milling-spindle are secured to and move withthe bar 24, which is pivoted in the fulcrum-spindle 29. As thedie-holder 18 and the milling-tool 42 are nearer the fulcrum than thedie-holder 14 and the stylus 37, every motion of the stylus vertical orhorizontal is reproduced by the milling-tool on a smaller scale, and thedie in the die-holder 18 will be an exact reproduction of the die in thedie-holder 14, but on a smaller scale.- If the die is to be cut so as toform the reverse to the original die, the fulcrum is placed between thetwo die-holders, so that the axes of the screws 28, on which the yoke 25is pivoted, and the axis of the spindle 29 are exactly equidistant fromboth the centers of the two die-holders 14 and 18. The longitudinaladjustment of the yoke 25 on the arm 27 is for the purpose af varyingthe vertical traverse of the milling-tool.

In the position as shown in Figs 1 and 2, if the yoke 25 is secured onthe arm 27 farther toward the end of the machine the vertical traverseof the milling-tool is increased, and if the yoke is secured fartherfrom the end and nearer the milling-tool the vertical traverse of themilling-tool is reduced. When the fulcrum-support of the bar 24 isplaced between the two die-holders, the same effect is produced on themilling when the yoke 25 is secured on the arm 27 nearer to or fartherfrom the milling-tool than the center of the moves toward the center ofthe die and diminish as the cutter moves toward the periphery of thedie. The shaft 45 extends longitudinally and is journaledin suitablebearings. At one end it is provided with the pulleys -16 and 47. One ofthese is apulley loose on the shaft and the other a pulley secured tothe shaft. A belt extends from these pulleys to a counter-shaft, andthus power is supplied to the machine. On the other end of the shaft theband-pulley 48 is secured, from which power is transmitted through thebelt 49,extending over a series of guide-pulleys and around the pulley43 on the milling-tool spindle 41. The belt 49 returns over a series ofguide-pulleys and a pulley on the weight 50 to the band-pulley 48. Bythis arrangement of the belt 49 and the weight 50 the milling-toolspindle has a considerable range of lateral motion and the strain on thebelt is uniformly maintained. the double cone-pulley 51, having thebases of the cones in the center of the pulley, and above the same isthe double cone-pulley 52, having the apexes of the cones in the center.The double cone-pulley 52 is secured to the shaft 53. The belt 54connects the two conepulleys 51 and 52 and transmits motion from thecone-pulley 51 to the cone-pulley 52. The belt 54 is controlled by theshipper 55, connected by the band or cord 56 to the carriage 57, fromwhich the post 31 extends through the slot 30 in the bar 24 and betweenthe rolls 32. To the opposite side of the shipper 55 the cord or band 56is secured, the opposite end of the cord or band being secured to thecounterbalance-weight 56 or passed around a pulley on thecounterbalz-tnce-weight, and has the end secured to a fixed part of themachine, as is shown in Fig. 1. The carriage 57 is moved transversely tothe bed-plate or table 8 by the screw 58, journaled in the frame 59, thecarriage being provided with a nutin which the screw turns. The screw 58is provided at one end with the hand-crank 60 and with the bevel-gear61, which meshes with the bevel-gear 62 on the shaft 63, the lowerportion of which shaft has the cone band-pulley 64 secured to it. On theshaft 53 the cone band-pulley 67 is secured, and this is connected bymeans of a belt with the cone band-pulley 68 on the shaft 21, andthereby motion is .imparted to worms 22 and 23 and through them to thedie-holders 14 and 18. The cone band-pulleys l7 and 64 are connected bythe belt 69.

By the cone band-pulleys 67 and 68, each of which consists of threeband-pulleys of different diameters placed so that the smallest pulleyof one cone is opposite the largest pulley of the other, the speed ofthe worms,

and through them the revolutions of the die-' holders and dies, can beregulated to suit the nature of the die, the depth of the cut, and thematerial by moving the belt 70 from one set of pulleys to another. Inthe same manner the transverse feed can be regulated by On the shaft 45is also secured changing the belt 69 on the cone band-pulleys 17 and 64,and thus increasing the speed of the screw 58, and consequently thetransverse motion of the free end of the bar 24, and with the same thestylus and the millingspindle. As shown in the drawings, the belts onthe cone band-pulleys 17 and 64 and 67 and 68 are on the smallest pulleyof the driving-cone and the largest pulley of the drivencone,thustransmittingtheslowestspeed. The stylus and the milling-toolare at the center of the respective dies, and the belt 54, controlledbythe shipper 55, is at the center of the double cone-pulleys, where thegreatest speed is transmitted to the die-holder. If now the machine isstarted, the screw 58 will draw the bar 24:, and with it the stylus andcutter, across the face of the die rearward by moving the carriage 57with the post 31 toward the rear of the machine. The shipper 55 willlead the belt toward the right, where the cone-pulley 52 increases andthe cone-pulley 51 decreases in diameter, so that as the diameter of thedie operated on or the distance of the millingtool from the center ofthe die increases the revolutions of the dies decrease and the feed ofthe material to the milling-tool is practically uniform. As the diesrevolve while the cutter and stylus traverse the same, the whole die ispassed over by both the cutter and the stylus by traversing one-half ofthe diameter. The machine may therefore be adjusted by turning the crankby hand until the stylus and the milling-cutter are on the extreme outeredge of the dies and run until the stylus and milling-cutter havereached the center of the die, when the milling-cutter will have madeone out over the whole die. The milling-cutter may now be adjusted bythe screw 44 for the next cut and the traverse continued until thestylus and milling-cutter have reached the edge of the die opposite theside from which they started. As shown in the drawings, the automatictraverse of the bar 24:, the stylus, and the milling-outter is from thefront to the rear of the machine, where the hand-crank 60 is secured tothe screw 58, by which the whole may be returned to the front by turningthe screw 58 so as to slide the carriage 57 toward the front.

Having thus described my invention, I claim as new and desire to secureby Letters Patent-- 1. In a die-milling machine, the combination, withtwo die-holders and mechanism for rotating the same, of a bar secured toa sup port having capacity to permit the bar to move vertically andhorizontally, a stylus or tracer adj ustably secured to the bar, amilling-tool supported by the bar, and mechanism for rotating themilling-tool and traversing the bar horizontally across the die, asdescribed.

2. In a die-milling machine, the combination, with a milling-toolsecured to the end of a vertical spindle and having capacity to traverseacross the face of the die, a table or bed-plate having a slot, andslide-rests adj ustably secured to the bed-plate, of die-holdersprovided with spindles extending through the slot in the bed-plate, andmechanism for rotating the die-holders and milling-tool and moving thesame across the face of the die, as described.

3. In a die'milling machine, the combination, with a table or bed-platehaving a slot and slide-rests adj ustably secured to the bedplate, ofdie-holders provided with spindles journaled in the slide-rests andextending through the slot in the bed-plate, worm-gears secured to thespindles of the die-holders, a driving shaft provided with detachableworms, and a milling'tool secured to the end of a vertical spindle and astylus or tracer, both supported on a pivoted arm, the whole constructedto turn the die-holders simultaneously at the same speed in the same oropposite directions and the milling-tool across the face of the die, asdescribed.

4. In a die-milling machine, the combination, with die-holders andmechanism for turning the same, of a bar secured to a support pivotedvertically and horizontally, a stylus adj ustably secured to the barover one of the die-holders, a milling-tool adj ustably secured to thebar over another die-holder, and a leading-screw operating a carriageconnected with one end of the bar, by which the bar is moved and thestylus and the milling tool are moved across part of the whole of thefaces of the dies, as described.

5. In a die-milling machine, the combination, with the die-holders, thebar provided with the stylus and the milling-tool, and mechanism forturning the die-holders, of the support for the bar, consisting in thespindle 29, the arm 27,- the yoke 25, and the screws 28, as described.

6. In a die-milling machine constructed substantially as hereindescribed, the adj ustable fulcrum consisting in the spindle 29, the arm27, provided with a series of holes, the yoke 25, the screws 28, adaptedto secure the yoke pivotally to the bracket, the hand-wheel 29, andscrew 29 forming a vertically-adjustable support for the spindle 29, asdescribed.

7. In a die-milling machine, the combination, with the die-holders, themilling-tool, and stylus, of the shaft 415, provided with the doublecone-pulley 51, the shaft 53, provided with the double cone-pulley 52,the cone bandpulley 67 on the shaft 53, the cone band-pulley 68, andbelts connecting the cone-pulleys, the shaft 21, the worms 22 and 23,and the worm-gears 16 and 20, secured to the spindles of thedie-holders.

8. In a die-milling machine, the combination, with the die-holders, themilling-tool, and stylus, of the driving-shaft 45, provided with thepulleys t6 and 47, the double cone-pulley 51 and the band pulley 48, theshaft 53, having the double cone-pulley 52 and the cone band-pulley 67secured to it, the cone bandand belts connecting the cone-pulleys, theshaft 21, provided with. the adjustable worms 22 and 23, the worm-gears1t; and 20, secured to the spindles of the die-holders, and the belt 49for driving the milling-spindle and provided with the tension-weight, asdescribed.

9. In adie-milling machine, the combination, with the die-holders,mechanism for rotating the same, a bar pivotally supported alcove thedie-ho1ders,a stylus adjustably secured to the bar, a milling-spindlesupported by the said bar mechanism, substantially as described, forrotating the milling-spindle, and mechanism for moving the stylus andmilling-tool across the. face of the dies, of the double cone-pulleys 5]and 52, the belt 54:,

p ulley 68 and the shipper connected with the traversing mechanism bythe band 56 and with the counterbalaucc-weight 56 by the band 56', asdescribed.

10. In a die-milling machine, substantially as herein described, thecombination, with the pivotally-supported bar 24:, of the weight 34:,connected with the bar by the strap or chain 33, and mechanism formoving the free endof the bar horizontally, as and for the purposedescribed.

In witness whereof I have hereunto set my hand.

ERNEST MEYERS.

Witnesses:

HENRY J. MILLER,

JosEPH A. MILLER, Jr.

